Mechanism for grinding crank shafts



Sept. 11, 1923. 1,467,402 A. THOMAS I MECHANISM FOR GRINDING CRANKSHAFTS Filed Sept. 20. 1922 k M *Zz' WITNESSES INVEIZJIOR:

Patented Sept. 11, 1923.

AUGUST THOMAS, OF BERLIN-SCHONEBERG, GERMANY, ASSIGNOR T0 DEUTSCHE WERKEAKTIENGESELLSCHAFT, OF BERLIN, GERMANY, A GERMAN CORPORA- TION.

MECHANISM FOR GRINDING CRANK SHAIETS.

Application filed September 20, 1922.

T 0 aZZ whom it may concern Be it known that I, AUGUST THOMAS, a citizenof the German Republic, residing at Berlin-Schoneberg, Germany, haveinvented certain new and useful Im rovements Relating to Mechanism forrinding Crank Shafts, of which the following is a specification.

This invention relates to mechanism for grinding crankshafts, and itsobject is to provide mechanism for grinding revolving crankshaftswhereby the tool, that is the grinding disc, in dressing the crank-pin,is made to follow same through the intervention of an adjustably securedeccentric at the front of a rotary cylinder and which carries anadjustably disposed rotary grinding disc on the eccentric strap, whichlatter is seated in a slide in which it is enabled to move in itsupright position, said slide be ing laterally movable on thecarrier-slide of the slide-rest.

An illustration of the invention is shown in the accompanying drawings,in which 1- Fig. l is a sectional side elevation, and Fig. 2 transversesection on line 2-2 looking in the direction shown by the arrow A.

In this illustrative embodiment of the invention, the driving drumrotatably mounted in a casing of the slide-rest, is longitudinallyslidable upon an inner drum which is rotated by said driving drum. Theinner drum is mounted by one end on a spindle running in a bearing,while the other end of said drum carries the chuck for the crankshaft.The free end of the crankshaft is held by the centre-pin of the slidingpuppet. The driving drum carried by the slide-rest has peripheral teethin engagement with a toothed pinion driven by belt-pulley. The grindingdisc is separately driven by a beltdrive.

Upon the bed a, a of the machine is mounted the longitudinally movablesliderest 6 provided with two bearing rings 0 for the driving drum d.The drum has a toothed ring 6 with which engages a toothed pinion e Thepinion is driven through the intervention of a belt 6 and pulley e inwhich latter the shaft f with its long feather f is enabled to slide soas to follow the displacement of the slide-rest Z2. Fixed to the SerialNo. 589,478.

11 so as to position the casing more or less near the crank-pin. Forthis purpose, the casing k has external V-ledges m which engage incorresponding grooves of the sledge 7 A spindle 'n with handwheel npermits of adjustment of the casing 70 The grinding disc 70 is rotatedthrough the interven tion of the belt 0. In the drum (5 is fitted a drum7' which at one end carries the chuck s for the crankshaft 25, while theother end is fast on the spindle p. In the driving drum d is fixed a keyu which engages in the longitudinal groove '0 ofthe inner drum 1', sothat same as also the crankshaft t participate in the rotary movement.The crankshaft 6 fixed in the chuck s, has its other end centered on thepin to of the puppet z. The shaft .9 serves in moving the slide-rest b.

The operation of grinding the crank-pins is as follows Having securedthe crankshaft t in the chuck s and centre-pin w, the grinding disc k isbrought in contact with the crank-pin by suitably turning the handwheeln after which the pulleys of the belts e and 0 are started. This willcause the belt pulley e and toothed pinion e to revolve and so impartrotation to the drum of. The eccentric it turns in the up and downmoving sledge 11 upon the horizontally moving cross-sledge Z and thusimparts to the grinding disc k a corresponding vertical and horizontalmotion causing same to follow the path of the crank-pin and grinding it.By turning the handwheel n the casing 70 with its grinding disc 70, canbe adjusted. Self-feed is obtained by the action of the shaft 3 I claim:

Mechanism for grinding revolving crankpins of a rotated crankshaft,which consists in a rotary and endwise movable cylinder, a slide-restcarrying same, an inner cylinder rotated by the rotary cylinder, meansfor retaining the inner cylinder from participating in the endwisemotion of said rotary cylinder, a chuck carried by the inner cylinder,an eccentric connected with the front of the rotary cylinder avertically and horizontally movable strap for the eccentric guidingmeans for the eccentric strap, a horizontally displaceable casing guidedon said strap, a grinding disc rotatably mounted in said casing, drivingmeans for the grinding disc, driving means for the rotary cylinder, andself-feed for the slide-rest, allas and for the purpose stated. 15

AUGUST THOMAS.

